Visit your Account page and on the left hand menu click “My stored cards”. You can view, edit or delete your existing stored cards here and also add new ones. New cards can also be added during the payment set up process, when scheduling a new payment.
Note: If you recently added a new credit/debit card or updated your card information on your CardUp account, a temporary charge of $0.50 is made to verify that the card is issued and the bank will allow it to be authorized. Regardless of whether or not the authorization is declined, CardUp will refund the authorization charge within 7 business days.
How to add a card
How to delete a card